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Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method
Science and Technology of Nuclear Installations ( IF 1.1 ) Pub Date : 2020-11-30 , DOI: 10.1155/2020/8839399
Qingzhu Liang 1 , Mingxing Liu 2 , Peng Xiao 2 , Yun Guo 1 , Jun Xiao 3 , Changhong Peng 1
Affiliation  

The aim of this study is to verify if the reliability of a digital four-channel RPS under the design phase satisfies the specified target and to identify the weakness of system design and potential solutions for system reliability improvement. The event-tree/fault-tree (ET/FT), which is the method used in the current probabilistic safety assessment (PSA) framework of nuclear power plants (NPPs), was adopted to developed reliability modeling for the RPS with the Top Events defined as the system failure to generate reactor trip signal and the system generating spurious trip signal. The evaluation results indicate that the probability of the system failure on demand and the frequency of spurious trip signal generation are 1.47 × 10−6 with a 95% upper bound of 4.63 × 10−6 and 7.94 × 10−4/year with a 95% upper bound of 2.50 × 10−3/year, respectively. The importance and sensitivity analyses were conducted and it was found that undetected unsafe common cause failures (CCFs) of signal conditioning modules (SCMs) dominate the system reliability. Two preliminary optimization schemes relative to reducing periodic test interval and adapting two kinds of diverse SCMs were proposed. Results of the quantitive evaluation of the schemes show that neither of them could determinedly improve the system reliability to the target level. In the future, more detailed optimization analysis shall be required to determine a feasible system design optimization scheme.

中文翻译:

基于事件树/故障树(ET / FT)方法的安全相关数字反应堆保护系统的可靠性评估

这项研究的目的是验证数字四通道RPS在设计阶段的可靠性是否满足指定的目标,并确定系统设计的弱点和提高系统可靠性的潜在解决方案。事件树/故障树(ET / FT)是当前核电厂(NPPs)概率安全评估(PSA)框架中使用的方法,被用于开发具有Top Events的RPS可靠性模型定义为系统无法生成反应堆跳闸信号以及系统生成伪跳闸信号。评估结果表明,系统按需出现故障的可能性和伪跳闸信号的产生频率为1.47×10 -6,其95%上限为4.63×10 -6和7.94×10-4 /年,其95%上限分别为2.50×10 -3 /年。进行了重要性和敏感性分析,发现信号调节模块(SCM)的未检测到的不安全共因故障(CCF)决定了系统的可靠性。提出了两种与减少周期测试间隔和适应两种不同的单片机相关的初步优化方案。方案的定量评估结果表明,它们都不能确定地将系统可靠性提高到目标水平。将来,将需要更详细的优化分析来确定可行的系统设计优化方案。
更新日期:2020-12-01
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